Answer:
composed of two or more parts, elements, or ingredients:
Explanation:
The theoretical yield of Ca(OH)₂ : 42.032 g
<h3>Further explanation</h3>
Given
31.8 g of CaO
Required
The theoretical yield of Ca(OH)₂
Solution
Reaction
CaO + H₂O⇒Ca(OH)₂
mol CaO (MW=56 g/mol) :
= mass : MW
= 31.8 g : 56 g/mol
= 0.568
From equation, mol Ca(OH)₂ = mol CaO = 0.568
Mass Ca(OH)₂ (MW=74 g/mol) :
= 0.568 x 74
= 42.032 g
Answer:
Yes its both a physical and chemical change heres why.
When heated , the wax melts to form a liquid wax . The liquid wax then becomes a solid wax upon cooling ( Physical change )
When the candle is lit, the wax near the tip of the candle will melt . The wick then absorbs the liquid wax . The liquid wax then vapourizes due to the heat emitting from the flame . The wax vapour then burns to give off a black substance ( what we will to as CO₂ , soot ) , heat and water vapour
(Chemical change )
Brainliest ? Hope I answered your question
Answer:
The answer to your question is 43.9 g of NaCl
Explanation:
Data
Grams of NaCl = ?
Volume = 0.75 L
Molarity = 1 M
Number of moles = ?
Formula
Solve for number of moles
Number of moles = Molarity x volume
Substitution
Number of moles = 1 x 0.75
= 0.75
Molecular weight of NaCl = 23 + 35.5 = 58.5
Calculate the grams of NaCl using proportions
58.5 g of NaCl ---------------- 1 mol
x ---------------- 0.75 moles
x = (0.75 x 58.5) / 1
x = 43.9 g of NaCl
